Agh! I love this book! Cinder is such a marvelous character, full of insecurities but also confidence, beautiful in her own grease-monkey way, quick to laugh and joke but also serious. Such a well-rounded, well-written character!
There are great supporting characters who don't fill the trite roles you would expect, but have their own back-stories and personal quirks. Kai is a personable and likable Prince because he gives off an 'everyman' quality that draws the reader to him.

The overarching plot was a bit predictable, but the real suspense was in the minutiae of the plot. The details of the story constantly surprised me, and the imaginative world of the Eastern Commonwealth and Luna kept me entranced through the whole book.

Cliffhanger ending... Gah! I must read the next book soon!